cannot access a website i have previously used

unsure which version i'v installed? can access regular websites but cannot access new website (local shire) With internet explorer i would have added the site as trusted, but the setup is diff on here, not sure what to try? thanks! Sandie
PS tried to access with alternative browser but cannot connect to ANY websites with Int Explorer which was my previous browser?

unsure which version i'v installed? can access regular websites but cannot access new website (local shire) With internet explorer i would have added the site as trusted, but the setup is diff on here, not sure what to try? thanks! Sandie
PS tried to access with alternative browser but cannot connect to ANY websites with Int Explorer which was my previous browser?

Application

More Information

Firefox can't find the server at www.irwin.wa.gov.au.scroll down..... * Check the address for typing errors such as ww.example.com instead of www.example.com * If you are unable to load any pages, check your computer's network connection. * If your computer or network is protected by a firewall or proxy, make sure that Firefox is permitted to access the Web.